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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1a26d92cb4c5c56ab356dbe751039246d9e5ec66a9af6ef9f0ff0b2c802632' 
  AND token = 'V7aP4wcb3tAMeImJ5nnfULnkZglWr/CRHBf4JuHF8II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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