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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13949685e776031acf05e2511ed19dfcd7870c2b3de69a9d32414027f51476eb' 
  AND token = 'ersh0BAhqh2oDuksLb8tl8L02VmVrdfFdaF6qobV88E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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