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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0804a3fc036a29c9b370f06fb9062bd41b15ebb0b21fd78b7605b50645dfc439' 
  AND token = 'gFS0siIVQnxWEQPx+18usFkt52bcd2/Nh78mNglRD3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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