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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e66d221b3e223389779b046a35d97ea0920d9cff81a0661ce4d3503de561ae' 
  AND token = '1F2jGSIdGgcdEqEPOwJhySczWnSw6p2+qh9NS0QZJxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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