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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcaa36cb031618c8f765ff3aab98e5ab22b2c513cd918a3d9b0f411764f2c72' 
  AND token = 'PKc15beoM4RoSzl0f7Qif0RhR25a8sJNw/6OfLtzoXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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