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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3000bcb56ed6dd702170dce0446be6ded4d434ed8cbdaccd367d8aea7f103d' 
  AND token = '0d+EB+ihp5eZ+KM1+/E5aPaUua9voqZ6EvJldU4dh30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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