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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741b24e67a1ad9b53c46cc442c9e10540158842817220bc7710c27b2cdd971eb' 
  AND token = 'O0qV61qgZsEUp1R7AV1LKjQacfdgnquzmr6uGYm73oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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