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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84cfe483a977f554e505b6ff823ff13091df83f4d7498cc740f3897434361e5' 
  AND token = 'Ieq4bLxiFgOOzQLLWB6Gnhcibt9nNjOP/ZSzA1hsBlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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