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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6dfeda69ee766519fde680882612522685cf0d1cb3d9c5d1881293d186b9de' 
  AND token = '9LuYDUeDD/nFj1JKN1tIFmd5eVJRNKcfNNo9hwXiIbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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