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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487a772db24baba1c7c09d3939220731590458257a3bcabff80fc5e5d847e6b3' 
  AND token = 'o2wAqlI3wAEx3DNRGOvDeblwRxviJX/e9plJMPoLtSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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