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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483aebced3676581d96f2086a205c79450fccc5991723c7aadf59cc79a79956e' 
  AND token = 'sd9s9Jaf3Hmq9e12Lsi+9uxPmjRAp9+XH9QNiAibT9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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