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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5b3d1cee46d6f44da6b8718da0f10d461e5df4eb3b8be92e719fb58521791d' 
  AND token = 'UbCTK3ODESrS+naO3vfen/N6apipe8T8DDOnyAz3h7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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