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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c37f76027ce4da1e56f7a92d505642d31b53a1c1c6830687272c6e37760350' 
  AND token = '4I8oVd0bBprHZ0UqAnRQbxXEhOEc5yL6kwzrJTig6oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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