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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5821cc5b7e277b28f2a4e09db718cd2aa3da3a7723431e3a52fc2dffd90a53ec' 
  AND token = 'AInEEj2W599eyQ1JyQ9X8hWDQ4qUQBE4MxFYlJwPsec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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