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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89dd5816ce9c9759afe9c54a7bee9d6bffcc3f2ff1f2e6d5712583a9e11a4e9' 
  AND token = 'Kh/uskQfEIN0o7k8F8hXvE1e+0sLM1H+iLlClrrmsSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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