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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e020c6ea1bb0c9c7f2baaa2f37ba8de6493a10f826628140de2f149acf1a1a' 
  AND token = 'cdaJtY0XXey3hvfWUTatozfxm5f1h4qEc4yImOTnjqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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