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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e96772f8146b8a526affbae53d38b185b5f21e07ae197b5c30fe2072c71c1fc' 
  AND token = 'Qmp3tczX9ih04ZZ2AnG/Kkq7G4/qEFdK/1iFeQj/LW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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