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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98e08f44fc7f00bc41604e6e0fba105351c78f7a5ebbf5885e646b6c5a577c7' 
  AND token = 'CaiUxtT2kMFxmsohtA815/uuYShsFJ2Ek0r/+mxLlxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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