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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10d986370c0426e92877a88890f357a04dcaae61d6a6bf1c4833b05e0bf2ef7' 
  AND token = 'JOB6pcJXxl4M/vOjt53l5zwa2LcTHNazEfz4+XbQ72A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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