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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550faa0f793b43143df7e95301d7ffbc110b0561caeaa425b2f1781de8b11452' 
  AND token = '9YTLjFu/QyB9jPkPVP4EgPlvpUdivpVLd9VVHflB1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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