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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92c25b3add2f3ab9f8b0f6e4b976ca0635054bbc5e7d9f6becfbe1733d8bf44' 
  AND token = '+YYqOpDXRcyOq7IaCaXUcBGCKm5+CEWXLrivW+ezK3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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