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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4381b3ff4b10fe36b7f0255b93cfa8e83d40d3c6e74f811713a3cd5c663806c' 
  AND token = 'tS9bhbw83HjKQbZWmR9yZK8wnn+n1ajPpWIfxy/cZdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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