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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8c0f59bd6db2ee98ac104dae2ea0b4ee6e3a3fef2890d44fcfd629d0a9b2f9' 
  AND token = 'ZKLXth0GyAeMrcJMh6mqchTg+V/cR+mweNbEYcdV4OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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