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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927f2c3f8344119e4e65b7627396f4e61476dba72c422362ffd5bc79ea786c2b' 
  AND token = '9s6c0vEVY4m8PNShkYB0NWPmEvRQVkQd/lGtK7/PwhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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