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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1581aae49c28e275ca2b5c107a76e9b6b3d7b59921d0bc378cfe764a94006254' 
  AND token = '2XDiG4B5+vWofT1Wg3sVDrc1Q95wuFvTywPU5YKcZ30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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