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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e717f9da41b70f45c632652891661c798f64cd0919240a035a0bcf5e26cf416' 
  AND token = '6fkATg/A9YbBnONEVV6jc5/XEtS6Iw+vVE9Kn6nIJdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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