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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51148e8676238779edbe662c719b1a5b4ee76a4e877f5bf2553dcb3353d6d7e0' 
  AND token = '8jCH+WIa/HoXgspMIQF/GvWn10uxuWCoCK+U3b2deCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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