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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd078c3c82e5d54506b7e8c58075d4bd38045dad33680767064aa3fff334834' 
  AND token = 'efAFYgza/JFMalBSCBl6i/2jI5zRUy2b2I1O7zw9YX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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