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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62fe3b01deeaf2e4c92305bf6e621342fa31f9f26d30b535e38fd8931363913' 
  AND token = 'QesQ2eRai/XwV/83UilKazUBWxaq5VoCN9Ss7FYfGqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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