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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cbfc60304c674a463170be8d794bfe87aa89e3cb957ba83844401b1ba96e04' 
  AND token = 'rOerPM28WOMmBsOEO48Xi/lLPjY798IT69XqUHh3P/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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