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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bc455e0de32bdea35253455c1aaf86a8aeeb8b9f10f68e9ef61afc695d77da' 
  AND token = 'GGgAZa6JjWH/EmjNBqXZY67oYgZeszeNf7y54H1AfHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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