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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e1e426a642d6a17a72ca9c7ac135daf2b69b667dad74713636a2efb6a87746' 
  AND token = '0rztEszNjp7H7WY/N1IqcVO3ECxdR59YlO9/lllDSIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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