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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa801c18ba559e2ef7be4492662332bba20f2fed4b92b4c3cb15f658212810c' 
  AND token = 'WCQPRqRN+T4SyvSlXPaozTOmBvocUNHtCq9Fs7JCcH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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