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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58054a8244e66df36377fbd5be73a56ace8a40c8b0842f04b0ae7fea96a58b8f' 
  AND token = 'lQCHp4F99eGG2EDuAUjoncfbY6aA3KBwAkjGxr+oRVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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