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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3010818c670f2e62e507df06560d9b8e72faf5e4817d1348e02f9dee5882ba' 
  AND token = 'vCb1ZkhTsiUXsjrzIsTJgcn0QrMQgQwYbEL1IlZyYbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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