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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a339396fbee0a071a306b03e331c4f7115b6711cc9026ea7c3e4b6dcaf189bf' 
  AND token = 'n3g9AI1MHIHzIFBRgCT+MZIKzVUferjZf7enf1L+qK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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