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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3688928220ec15e6d525ecc66f45f921cba91aaf60363ef82fedc1452e1aa27' 
  AND token = 'AUzQ2AfUVi3sb0Bt3crK9K65Zr71ZgHQzXdkcL67oq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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