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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7155833aa71919c1cd442658f860ccf5a9bee7e3378966d67c6b86c2d752b9a7' 
  AND token = 'ahl9Ke2n4DrymZ9x0MZACG8EECcCMEDkd3tItoZPH84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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