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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e968ddac3bf7dafa1f20c13ccf6a774606e00ea6d7abac0bacca7dbf1957bb0' 
  AND token = 'MtwXZ+shfwTpK63SEggKjeixaYawnn2/W/IPqCDYvPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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