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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdc218f3e1454a33745f198084643751c028d340b09adb72309ae1d831101fe' 
  AND token = '/h6nOywdTEpcz35uRq/nB7kDTzMDZsNmx0J6N2s0XF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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