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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ebb6becb796358042f6971aa3d1dabd746b5f9ea625a093962330af146c060' 
  AND token = '2ab9sfuukkU/MkwANYBXGLeKK5mAjSGZcTgWmnN5zF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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