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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47bf19f401c8d8e70939a4c3843967abdddfcd7869dae48626a0fff5c8e94ef' 
  AND token = '8t3cm+n+nHKrng8Uw29JWOGujNHknzMYwFqk8ymp4qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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