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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd697f68fdca35370c1e47ffc70056aab21f1b0a63cc4a7aeb82663c6e0c39adf' 
  AND token = 'nUoPbPAiWxAKeqF1F/5dM3d1zxTvjVPcCdaSrmpfIfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00169

JSON explain

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