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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41709de3240a99e95b60113d9f617949b2461184e5eb553daa6c2438d0290f6d' 
  AND token = 'XTD91xXr02SXp+q/uYN0N03tL7LHC+FDDiLrMa/BW58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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