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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc84a93d6afc06e834ec3f29f003bd74f8700af936f363a4fd13d27d1471d7eb' 
  AND token = 'n1SybEl6gGbv3obb2eRsonhm0x5psUP8LnvCh9vVrq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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