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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44704322141c9d74db795cfbe94b10f8a6c234c59445f48464d0c2f60cc1a65' 
  AND token = 'OqRfArl1xtVIfEIAgKrU1X/NRF/N5vTXq1KkGOfAI2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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