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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364618c07e4afa63e747a9e0b7452091ccbd5a0a40d79638b7939b10db110982' 
  AND token = '/7WaLqli7qCApPiCIFMb+wNuEsRi7EtjNJ5cI3CEmbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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