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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c04d0008b4e00b470ec37da6d73b8902c6a11480024932460eacfda4563884' 
  AND token = 'uQT8N5xI0Ijq9hkJXDbR7V7bfkiFvsG4t3TtazWhhhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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