SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2058597d9b41f954dc8e42cf2abefe2b4fa1be5d024f70d7dc7fd18d11319d2' 
  AND token = 'WMpyqGVC1o6SAzBQDQOZRPDjHvImbbQ1glUy0BE5JCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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