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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af061191968701268783725d907fe42da1a566038e5b13191a5d7b864be7a8bc' 
  AND token = 'eQoreJpBT5/MysIfxvDpo+WoPbTctIMByh+jX/ZADxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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