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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3565167993fa30f28e62f6e0b139599e5276ffd31ed777ad9c38e8a7850157' 
  AND token = 'fBb56CGRCZ/zeCUdkfxdPJ9B3/plKbynMQBvxbLkO1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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