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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60a9572d5a0e3034f042cf41fbe99f6d2a03a2741babf5158e2813c1c27bdf9' 
  AND token = 'CRWG3NQDsPGIJr+x5aTTEFjDrSd8tjSFe4CJ+BdRnWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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