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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8927d8824dfaac7a83dbc53b5a58f93fc04c8a5c85fe4351296d17bfe84c81b' 
  AND token = 'jBNvYs+LBXRI4m+VebLbNYXWmOcprMQCEnU2+9qNEoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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