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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2acc889a615ada99e38c60c91bb5767242b08bd1dc614b6e872c5149cbb7fc81' 
  AND token = 'GylwXaLULPkXZl89rwNFOZ3LvIuvuRN5eSxLJTlar9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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