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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f669b141bc5158f9f2aa126de2d4bd5f24bea98eecaeff65747e7dc5a75b3fe' 
  AND token = '7WTgqqLzcXe//ZSMjBtbY3pKnaLbGLMYbRD9KcLFUcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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