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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd01b501d8f95fa34d29a28888286f6a4e95e5ca56ba64e8465d63e457fe077' 
  AND token = 'gO+NfGCf9oSg3XXF4m1IPEIh9vp2wRWMDB34mftNKao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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