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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1c4e835e5a346b00e54d90acc2d55373054b629de88050ebf31dc5050ea3ef' 
  AND token = 'HabDsOYcomZQPCC7Ws5q3LKutQjsZLDMDgLmiCJLqwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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