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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2f3d6ae94b811c53881fd4500ed85d1dc92e292dbf3d22580d5cfcf0a10771' 
  AND token = '8PaaEuH46mzNnWrhNUs2S3HIP/qEnVJrNdcDKHTH2xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}