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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fb7bbf1e00af1a87516ea70c7cb51e3eac1ca5b11d16c78ff98dfc02c2d806' 
  AND token = 'DY8vfbRHgm95tNJ1C6z8pZb4NPZh4FTucRI52D9C8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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