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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30e61d3fc837466e105ad059f128a00fe0389eebe8b6bf01288f7919dd06a3f' 
  AND token = 'sVtaDUv/CZ1peRbySMeqFLFAol7N7A06RLuSXWybHlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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